l
35
Low Temperature Operation
Introduction
The SceneScan Sensor is a precision electromechanical device with hardware components
that, out of necessity, are mounted in an external position on a vessel’s superstructure. It
is recognised that industrial marine operations may subject these components to harsh
environments, including low temperature.
The SceneScan hardware complies with the requirements of IEC 60068-2-1 and is able
to operate for prolonged periods at temperatures down to – 25°C provided that certain
operating conditions are maintained.
Operating Conditions
The following recommendations are made for low temperature use:
•
If it is necessary for the system to be switched on after a prolonged period at
temperatures below -5°C (and down to – 25°C) the Sensor will warm itself, but will
require 2 hours to reach optimum operating condition.
•
If the unit is switched on after a period at temperatures between -15 to -25°C it will
not communicate with the Dashboard and the rotor will not rotate until the internal
temperature of the base unit rises above -15°C.
•
When the system is not in use (i.e. un-powered or suspended) the Sensor should be
protected by means of a suitable insulating and protective cover to prevent the external
build-up of ice.
Technical Considerations
•
The SceneScan Sensor uses a sophisticated rotating infrared laser range-finder to
accurately measure the distance and bearing to features in the scene. Movement
sensors allow mechanically driven optics to compensate for vessel motion due to wave
action. The internal mechanism may become disabled if it is allowed to cool in a low
temperature environment.
•
A safety interlock prevents activation of the range-finder laser if the scanner rotor head
stops or is prevented from rotating by ice build-up.
Summary of Contents for 20-0253
Page 81: ......
